Which particular diecast forum are you a member of Monster?
Even though I'm not an 'enthusiast' when it comes to diecasts (as in, I don't compare in great detail the build quality and accuracy of Minichamps-vs-Kyosho-vs-AutoArt..etc.), I still think the 1:18 M3 GT2 is fantastically detailed, even to the point of having the name of the brand on the brake calipers!
It cost a pretty penny (US$198 incl. shipping), so by far my most expensive model (those NASCAR diecasts sell for $60~), but this will probably also be my last model since it's the be-all, and end-all for a model I'd love to have. Makes it extra special since I own an E92..so there's a little bit of bloodline there.